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annotate target-utils/libc/strncat.c @ 965:2969032bdfac

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fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing The only 100% safe way to pass a NULL pointer as a function argument in K&R C is to cast 0 to a pointer type; failing to do so may cause mysterious bugs (invalid stack frames or garbage in argument registers) on 64-bit machines. This issue has already been fixed in most of FC host tools, but I just found some missed spots: passing of NULL UDH to PDU encoding functions in fcup-smsend[mult] in the case of single (not concatenated) SMS.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 01 Sep 2023 07:33:51 +0000
parents 7fb62fc724dc
children
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7fb62fc724dc target-utils/libc: beginning of newlib-ectomy
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1 /*
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2 * Concatenate s2 on the end of s1. S1's space must be large enough.
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3 * At most n characters are moved.
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4 * Return s1.
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5 */
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6
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7 char *
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8 strncat(s1, s2, n)
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9 register char *s1, *s2;
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10 register n;
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11 {
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12 register char *os1;
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13
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14 os1 = s1;
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15 while (*s1++)
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16 ;
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17 --s1;
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18 while (*s1++ = *s2++)
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19 if (--n < 0) {
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20 *--s1 = '\0';
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21 break;
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22 }
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23 return(os1);
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24 }